Customer is applying patch 13486856 and getting error

Customer is applying patch 13486856 and getting error
Applying XDF file : \oracle\EBSTEST\apps\apps_st\appl\ego\12.0.0\patch\115\xdf\ego_mtl_sy_items_ext_b.xdf
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Table Name is EGO_MTL_SY_ITEMS_EXT_B
Exception occured :ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at "APPS.FND_XDF_UTIL_PKG", line 55
ORA-06512: at line 1

java.sql.SQLException: ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at "APPS.FND_XDF_UTIL_PKG", line 55
ORA-06512: at line 1

From the adworker log file I see the following

System is trying to apply file ego_mtl_sy_items_ext_b.xdf